Korea is a character from Hidekaz Himaruya's Axis Powers Hetalia. His human name is Im Yong Soo.
Yong Soo has bundles of energy to expend which is why he usually puts his soul into whatever his passion may be at the time. However, this double edged knife also means that his hobbies tend to jump rapidly from one to another. The only consistency in his life revolves around his infatuation with Yao and Kiku and developing new gadgets with his "awesome Korean technology". His technology is decent because he tends to jump on opportunity, but because he jumps on new things, he's often not the originator.
Yong Soo is a little...offbeat. Sometimes he does completely "abnormal" things that are on the borderline of perversion. He's a good kid, though, not doing it based on his carnal drive. Most of the confusion is caused by his tenancy to say blunt things, though it's not always what he's thinking. In fact, his habit of saying things often lead to worse situations because he's too dense to truly grasp the intention behind the actions of others. At the core, it's not so much that he's an idiot than it is he jumps to his own conclusions and accepts them as the sole truth.
Yong Soo tends to bottle up his disappointment even though it shows clearly on his face. He's definitely a character of emotion, unable to hide secrets or keep them. He acts upon them; a single smile from Yao can change his whole day.
Korea is a great country where Hyundai makers own squads of ninjas to convince German car makers that Volkswagen originated in Korea. Okay, that's joking, but seriously -- what equipment and tools?